IMA System (BCM)

Advanced Diagnostics - DTC U1204 (55): IMA-CAN Malfunction (Powertrain Control Module (PCM)- Battery Condition Monitor (BCM) Module)






General Description
The integrated motor assist-controller area network (IMA-CAN) uses two signal lines, IMACANH and IMACANL, and it receives and transmits multiple signals simultaneously to/from multiple control modules. When the information is not sent from the powertrain control module (PCM) through the IMA-CAN and this condition continues for a specified time or when the information sent from the PCM is abnormal and this condition continues for a specified cycle, the battery condition monitor (BCM) module detects a malfunction and when BUS-OFF is not detected after the time to detect BUS-OFF has passed, a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
One of these conditions occurs:
- The information is not sent from the PCM through the IMA-CAN for at least 1 second and BUS-OFF is not detected after 2.0 seconds have passed.
- The information sent from the PCM through the IMA-CAN is abnormal at least 10 times and when BUS-OFF is not detected after 2.0 seconds have passed.

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM and the BCM module memory.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.